. >> reporter: but in libya, the fbi is just starting an investigation. besides the four murders, and the riots faced by president obama, there is the bloody rebellion in syria and new pressure on the u.s. from israel to get tougher on iran over nuclear weapons. republicans are implying president obama is wavering. >> this is a moment for americans to show our closest allies that we stand with them unequivocally -- unequivocally, no mixed signals. >> the middle east suddenly a factor in the race for the white house. i'm steve handlesman, nbc news, washington. >>> and we are learning more tonight about the other americans killed in yesterday's attack in libya. two of the men were former u.s. navy seals from san diego county. 4 #-year-old len d doherty was a trained sniper that worked as a private security contractor in countries including pakistan, afghanistan, and yemen. he was employed to protect the u.s. ambassador and had arrived in libya a week ago. he entered the seals in 1995 and ended his military service ten years later. his family says he was an